Some men force their way into the home of retired chief engineer Arthur Jönsson. They look through the house for a few drawings. Some time later the same men, who turns out to be former Swedish military, commit a robbery. Johan Falk and his colleagues at GSI get an uneasy feeling that the robbery is just an exercise for a much larger robbery. A robbery, as it turns out, will make all the other robberies in police history fade by comparison.
